Yaar, you didn't get my point. I have never taken my car to 3S for any mechanical work. Haan for body paint works and insurance claims they are best choice.
I can give note of multiple such roadside Mechanics who will never tell you to remove T-Stat. So all are not same.
Khair to cut the long debate short, jugaars and make-sense technics are not bad if they does not put engine or other related parts life threatened in long term.
Which for T-Stat is not the case...
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